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July 4th, 2026 :: 1:24 am CDT   

Local Weather Report for
Decatur
Illinois, United States

 Current Decatur Weather Conditions Updated July 3rd at 11:54 pm 
thunderstorm
Temperature:79°F Dew Point:70°F
Barometer:30.04 inHg Wind:N 15 Mph
Humidity:74.0% Visibility:0M
 
 Decatur Weather Forecast Summary  
 
Today
Jul 4th
Sunday
Jul 5th
Monday
Jul 6th
Tuesday
Jul 7th
Wednesday
Jul 8th
Mostly Sunny Thundershowers Mostly Sunny Mostly Sunny Sunny
87°F
85°F
68°F
80°F
66°F
79°F
65°F
84°F
66°F
 
 Decatur Detailed Weather Forecast  
 
Saturday, July 4th, 2026
Overnight Temperature: 75°F
Clear with cloudy periods with a chance of showers or thundershowers.
Morning Temperature: 79°F
Sunny with a chance of showers or thundershowers.
Afternoon Temperature: 87°F
Sunny with cloudy periods with a chance of showers or thundershowers. Windy at times.
Evening Temperature: 79°F
Mostly clear with a chance of showers or thundershowers.
Sunday, July 5th, 2026
Overnight Temperature: 69°F
Clear with a chance of showers.
Morning Temperature: 72°F
A mix of cloud and sun with a chance of showers or thundershowers.
Afternoon Temperature: 84°F
A mix of cloud and sun with a chance of showers or thundershowers.
Evening Temperature: 73°F
Mostly cloudy with showers likely. Chance of a thunderstorm. Windy at times.
Monday, July 6th, 2026
Overnight Temperature: 67°F
Clear with a slight chance of showers.
Morning Temperature: 72°F
Sunny. Slight chance of a thunderstorm. Windy at times.
Afternoon Temperature: 80°F
Sunny with cloudy periods. Chance of a thunderstorm. Windy at times.
Evening Temperature: 73°F
Clear with cloudy periods. Chance of a thunderstorm.
Tuesday, July 7th, 2026
Overnight Temperature: 68°F
Clear with cloudy periods.
Morning Temperature: 70°F
Mostly sunny.
Afternoon Temperature: 79°F
A mix of sun and cloud. Slight chance of a thunderstorm.
Evening Temperature: 73°F
Clear. Chance of a thunderstorm.
Wednesday, July 8th, 2026
Overnight Temperature: 67°F
Clear.
Morning Temperature: 73°F
Sunny. Slight chance of a thunderstorm.
Afternoon Temperature: 83°F
Sunny. Chance of a thunderstorm.
Evening Temperature: 78°F
Clear with cloudy periods. Chance of a thunderstorm.
Thursday, July 9th, 2026
Overnight Temperature: 72°F
Clear. Chance of a thunderstorm.
Morning Temperature: 76°F
Mostly sunny. Chance of a thunderstorm. Windy at times.
Afternoon Temperature: 85°F
Mostly sunny. Chance of a thunderstorm. Windy at times.
Evening Temperature: 81°F
Mostly clear with a chance of showers or thundershowers.
Friday, July 10th, 2026
Overnight Temperature: 74°F
Clear with a chance of showers or thundershowers.
Morning Temperature: 78°F
Sunny. Chance of a thunderstorm.
Afternoon Temperature: 88°F
Sunny. Chance of a thunderstorm. Windy at times.
Evening Temperature: 80°F
Clear with a slight chance of showers or thundershowers.
Saturday, July 11th, 2026
Overnight Temperature: 75°F
Clear. Chance of a thunderstorm.
Morning Temperature: 76°F
Sunny with cloudy periods with a chance of showers or thundershowers. Windy at times.
Afternoon Temperature: 85°F
Sunny with a slight chance of showers or thundershowers. Windy at times.
Evening Temperature: 77°F
Clear. Chance of a thunderstorm. Windy at times.





 

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12:08 AM  77°F
thunderstorm
 
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11:53 PM  75°F
 
 
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11:53 PM  75°F
 

 
This WeatherCity Weather Forecast for Decatur, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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